21321023003121 has 16 divisors (see below), whose sum is σ = 30100731732864. Its totient is φ = 13377690580224.

The previous prime is 21321023003083. The next prime is 21321023003171. The reversal of 21321023003121 is 12130032012312.

It is not a de Polignac number, because 21321023003121 - 2¹⁴ = 21321022986737 is a prime.

It is a super-2 number, since 2×21321023003121² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21321023003171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 153495 + ... + 6531891.

It is an arithmetic number, because the mean of its divisors is an integer number (1881295733304).

Almost surely, 2^{21321023003121} is an apocalyptic number.

It is an amenable number.

21321023003121 is a deficient number, since it is larger than the sum of its proper divisors (8779708729743).

21321023003121 is a wasteful number, since it uses less digits than its factorization.

21321023003121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6443960.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 21321023003121 its reverse (12130032012312), we get a palindrome (33451055015433).

The spelling of 21321023003121 in words is "twenty-one trillion, three hundred twenty-one billion, twenty-three million, three thousand, one hundred twenty-one".